Shaved ice thermodynamics help

suppose that 3.1 kg of shaved ice is needed to keep medication cold in a room without a refrigerator. What amount o heat must be removed from the 3.1 kg of water to make ice once it has reached 0 deg C

You need to know the enthalpy of formation for ice. Unless it says at certain temperature and press ure use the formation for STP>
enthalpy of formation website:http://wine1.sb.fsu.edu/chm1045/notes/Energy/HeatForm/Energy05.htm
another nice site with the enthalpy of fusion of ice on it:
http://www.physchem.co.za/Heat/Latent.htm [Broken]